#define _CRT_SECURE_NO_WARNINGS
#include<stdio.h>
#include<string.h>

int main()
{
	//char arr1[20] = { 0 };
	//char arr2[] = "hello world";
	//strcpy(arr1, arr2);
	//printf("%s", arr1);
	
	char arr[] = "hello world";
	memset(arr, 'x', 5);
	printf("%s", arr);
	return 0;
}

 